Characteristics and Advantages of BV Grade EH36 Marine Structural Steel Plates
- Aug 20, 2026
Knowledge
Complete Technical Specifications for BV Grade AH36 Shipbuilding Steel Plates
1. Product Overview
BV Grade AH36 is a high-strength hull structural steel plate certified by Bureau Veritas (BV) of France and classified as high-strength marine structural steel. It features excellent structural rigidity, stable low-temperature toughness (0°C), superior weldability and formability, as well as outstanding resistance to seawater corrosion and fatigue. It is primarily used in the construction of large vessels, offshore platform structures, marine engineering facilities, offshore wind turbine foundations, and marine machinery and equipment.
2. Applicable Standards
| Item | Technical Requirements |
|---|---|
| Steel Grade | BV AH36 |
| Standard System | BV Rules for Classification of Steel Ships |
| Product Type | High-strength steel plates for ship hull structures |
| Production Standard | Classification society-approved standards |
| Certification | BV certification (third-party inspection available) |
| Equivalent Grades | LR AH36, ABS AH36, NV A36, CCS AH36, etc. |
3. Chemical Composition
| Elements | Content (%) |
|---|---|
| C | ≤ 0.18 |
| Si | ≤ 0.50 |
| Mn | 0.90 - 1.60 |
| P | ≤ 0.030 |
| S | ≤ 0.030 |
| Cu | ≤ 0.35 |
| Cr | ≤ 0.20 |
| Ni | ≤ 0.40 |
| Nb | 0.02 - 0.05 |
| V | 0.05 - 0.10 |
| Ti | ≤ 0.02 |
| Mo | ≤ 0.08 |
| Als | ≥ 0.015 |
4. Mechanical Properties
1) Tensile Properties
| Item | Requirements |
|---|---|
| Yield Strength, ReH | ≥ 355 MPa |
| Tensile Strength, Rm | 490 - 630 MPa |
| Elongation, A | ≥ 21 % |
2) Charpy Impact Properties
BV AH36 must meet the following low-temperature impact toughness requirements:
| Thickness | Impact Temperature | Minimum Impact Energy |
|---|---|---|
| t ≤ 50 mm | 0°C | ≥34 J |
| 50 < t ≤ 70 mm | 0°C | ≥41 J |
| 70 < t ≤ 100 mm | 0°C | ≥50 J |
5. Supply Specifications
Common Size Ranges:
| Item | Range |
|---|---|
| Thickness | 5 - 150 mm (some manufacturers can customize thicker specifications) |
| Width | 1,200 - 4,000 mm |
| Length | 6,000 - 18,000 mm |
* Actual dimensions are determined based on the steel mill’s production capacity and shipyard orders.
6. Delivery Condition
Common BV AH36 Delivery Conditions:
| Delivery Conditions | Description |
|---|---|
| AR | As-rolled |
| CR | Controlled Rolling |
| TMCP | Thermo-Mechanical Control Process |
| N | Normalized |
| Q&T | Quenched and Tempered (for some thick plates) |
* Thick-gauge steel plates typically use the TMCP process to achieve high strength and excellent weldability.
7. Steel Plate Surface Quality
1) Requirements:
The surface must be flat and free of defects such as cracks, folds, and blisters;
Delamination defects that affect service performance are not permitted;
Shot blasting is permitted;
Shop primer treatment is available.
2) Common Surface Treatments:
Shot blasting
Primer coating
Anti-corrosion coating
8. Weldability
BV AH36 shipbuilding steel plates exhibit good weldability:
Suitable Welding Methods:
1) Manual Metal Arc Welding (SMAW)
2) Submerged Arc Welding (SAW)
3) Gas Metal Arc Welding (GMAW/MIG/MAG)
4) Automated Welding
Characteristics:
1) Low carbon content;
2) Low carbon equivalent;
3) No complex post-weld heat treatment required;
4) Suitable for welding large ship hull sections.
9. Carbon Equivalent
Typical calculation formula:
Ceq = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15
| Thickness | Ceq |
|---|---|
| 5 - 50 mm | ≤ 0.38 % |
| 50 - 150 mm | ≤ 0.40 % |
* BV AH36 shipbuilding steel plates ensure good weldability by controlling the proportions of C, microalloying elements (Nb/V/Ti), and Mn.
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